200
For how long has paper money been around? Closer to 2000 years, 1000 years, or 300 years?
What is 300 Years.
There are several types of money - money is a trading tool that is instantly liquid and usable for exchange.
Over the last three thousand years the concept of money (liquidity has been of several metals, copper, silver, and gold. These three metals were concepts of value and were accepted as the universal solvents that allowed tribal and personal commerce.
In the last 300 years the world added two more concepts of money (i.e. liquidity). These two new ideas were paper money and diamonds. Governments loved the concept of paper money, because in real terms of human energy, there was practically no cost.
In the last 30 years the world added two more forms of instant liquidity, platinum and credit cards. Platinum having the intrinsic value of a rare metal, comes in the form of coins or bars. Credit cards give us the ability to hock out our future labor, in other words, we can draw on our future ability to make money. In today's world credit cards are referred to as plastic money.